What is BS EN ISO 19143 - Filter encoding geographic information about?
BS EN ISO 19143 describes an XML and KVP encoding of a system-neutral syntax for expressing projections, selection, and sorting clauses collectively called a query expression. These components are modular and intended to be used together or individually by other standards which reference this International Standard. BS EN ISO 19143 defines an abstract component, named AbstractQueryExpression, from which other specifications can subclass concrete query elements to implement query operations. BS EN ISO 19143 also defines an additional abstract query component, named AbstractAdhocQueryExpresison
Who is BS EN ISO 19143 - Filter encoding geographic information for?
BS EN ISO 19143 on Filter encoding geographic information is useful for:
- Geospatial industries  
- Geographic data operators  
- Research and development team  
- Software developers/engineers  
- Software companies/ IT firms  
Why should you use BS EN ISO 19143 - Filter encoding geographic information?
A fundamental operation performed on a set of data or resources is that of querying in order to obtain a subset of the data which contains certain desired information that satisfies some query criteria and which is also, perhaps, sorted in some specified manner.
BS EN ISO 19143 defines The XML encoding for the following predicates:
- A collection of logical predicates that include and, or, and not.
- A set of standard comparison predicates, including equal to, not equal to, less than, less than or equal to, greater than, greater than or equal to, like, is null, and between.
- A set of standard spatial predicates, including equal, disjoint, touches, within, overlaps, crosses, intersects, contains, within a defined distance, beyond a specified distance, and BBOX.
- A collection of typical temporal predicates: after, before, begins, begun by, contains, during, ends, equals, meets, met by, overlaps, and overlapped by
- A predicate that checks whether an object's identifier matches the provided value.
Overall, BS EN ISO 19143 defines the XML encoding of metadata that allows a service to declare which conformance classes, predicates, operators, operands and functions it supports. This metadata is referred to as Filter Capabilities.
